:root{
  --ink:#0A0E14;
  --panel:#111823;
  --panel-2:#0F3B44;
  --line:#1E2A38;
  --cyan:#00E5FF;
  --cyan-soft:#7CF7FF;
  --orange:#FF6B1A;
  --white:#F5F7FA;
  --steel:#8A97A8;
  --focus:#7CF7FF;
  --r-xl:28px;
  --r-lg:22px;
  --r-md:16px;
  --r-sm:10px;
  --ease:cubic-bezier(.2,.8,.2,1);
  --fast:140ms;
  --mid:220ms;
  --font-display:"Archivo Black","思源黑体 Heavy","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"思源黑体","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SF Mono",ui-monospace,"Cascadia Mono",Menlo,Consolas,monospace;
  --shell:min(100% - 2.5rem,1240px);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  color:var(--white);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.01em;
  background-color:var(--ink);
  background-image:
    radial-gradient(900px 520px at 84% -10%,rgba(0,229,255,.13),transparent 64%),
    radial-gradient(760px 420px at 2% 8%,rgba(255,107,26,.08),transparent 62%),
    repeating-linear-gradient(90deg,rgba(30,42,56,.5) 0 1px,transparent 1px 96px),
    repeating-linear-gradient(0deg,rgba(30,42,56,.34) 0 1px,transparent 1px 96px);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:800;line-height:1.12;letter-spacing:.01em}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--cyan-soft)}
button{font:inherit;color:inherit}
[hidden]{display:none !important}
::selection{background:var(--cyan);color:#04141a}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px}

/* ---------- utilities ---------- */
.wrap{width:var(--shell);margin-inline:auto}
.mono{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.24em;text-transform:uppercase;color:var(--steel)}
.display{font-family:var(--font-display);font-weight:900;font-style:italic;transform:skewX(-7deg);transform-origin:left bottom;display:inline-block}
.t-hero{font-size:clamp(2.5rem,7vw,4.5rem);line-height:.98}
.t-section{font-size:clamp(1.55rem,3.4vw,2.5rem);line-height:1.05}
.t-card{font-size:clamp(1.05rem,1.8vw,1.4rem)}
.lede{font-size:clamp(1rem,1.5vw,1.12rem);line-height:1.75;color:var(--steel);max-width:42ch}
.eyebrow{display:inline-flex;align-items:center;gap:.6rem;margin:0 0 1rem;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.28em;text-transform:uppercase;color:var(--cyan)}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--orange)}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;left:50%;top:-4rem;z-index:120;
  transform:translateX(-50%);
  padding:.7rem 1.3rem;
  background:var(--cyan);color:#04141a;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.16em;
  border-radius:0 0 12px 12px;
  transition:top var(--mid) var(--ease);
}
.skip-link:focus{top:0;color:#04141a}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.55em;
  padding:.8em 1.45em;
  border:1px solid var(--line);border-radius:999px;
  background:transparent;color:var(--white);
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;
  text-decoration:none;cursor:pointer;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease),background var(--fast) var(--ease),transform var(--fast) var(--ease);
}
.btn:hover{color:var(--cyan-soft);border-color:var(--cyan-soft);transform:translateY(-1px)}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:#04141a;font-weight:700;box-shadow:0 0 22px rgba(0,229,255,.28)}
.btn--primary:hover{background:var(--cyan-soft);border-color:var(--cyan-soft);color:#04141a}
.btn--ghost{border-color:rgba(124,247,255,.35);color:var(--cyan-soft)}
.btn--alert{border-color:rgba(255,107,26,.55);color:var(--orange)}
.btn--alert:hover{border-color:var(--orange);color:#ffb189}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(10,14,20,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.scroll-progress{position:absolute;left:0;right:0;top:0;height:3px;background:rgba(30,42,56,.7);z-index:2}
.scroll-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--cyan-soft));
  box-shadow:0 0 14px rgba(0,229,255,.65);
  transition:width 90ms linear;
}
.header-shell{width:var(--shell);margin-inline:auto}
.masthead{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  grid-template-areas:"meta brand utility";
  align-items:center;
  gap:1rem;
  padding:1.15rem 0 .85rem;
  transition:padding var(--mid) var(--ease);
}
.masthead__meta{
  grid-area:meta;margin:0;
  display:flex;align-items:center;gap:.55rem;
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--steel);
}
.mono-dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:pulse 2.6s var(--ease) infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.8)}}
.masthead__brand{grid-area:brand;text-align:center}
.brand-mark{
  display:inline-block;
  font-family:var(--font-display);font-weight:900;font-style:italic;
  font-size:clamp(1.5rem,3.1vw,2.1rem);
  letter-spacing:.06em;
  color:var(--white);
  transform:skewX(-8deg);
  transition:color var(--fast) var(--ease),font-size var(--mid) var(--ease);
}
.brand-mark:hover{color:var(--cyan)}
.brand-mark__cn{color:var(--cyan);font-size:.6em;letter-spacing:.12em;margin-left:.2em;vertical-align:.14em}
.brand-tag{
  margin:.3rem 0 0;
  font-family:var(--font-mono);font-size:.6rem;letter-spacing:.42em;text-indent:.42em;
  text-transform:uppercase;color:var(--steel);
  transition:opacity var(--fast) var(--ease);
}
.masthead__utility{grid-area:utility;display:flex;align-items:center;justify-content:flex-end;gap:.5rem}
.utility__link{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.42rem .8rem;
  border:1px solid var(--line);border-radius:999px;
  color:var(--steel);
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.18em;text-transform:uppercase;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.utility__link:hover{color:var(--cyan-soft);border-color:var(--cyan-soft)}
.utility__link--icon{padding:.42rem .6rem}
.utility__glyph{
  position:relative;display:inline-block;width:11px;height:11px;
  border:2px solid currentColor;border-radius:50%;
}
.utility__glyph::after{
  content:"";position:absolute;right:-4px;bottom:-3px;
  width:2px;height:6px;background:currentColor;border-radius:2px;
  transform:rotate(-45deg);
}
.nav-toggle{
  display:none;align-items:center;gap:.55rem;
  padding:.48rem .8rem;
  border:1px solid var(--line);border-radius:999px;
  background:transparent;color:var(--white);
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.18em;text-transform:uppercase;
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--cyan-soft)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:2px;background:var(--cyan)}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:var(--cyan);
  transition:transform var(--mid) var(--ease),opacity var(--mid) var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

.nav-bar{border-top:1px solid var(--line)}
.nav-list{display:flex;justify-content:center;gap:.1rem;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}
.nav-list::-webkit-scrollbar{display:none}
.nav-list__item{flex:0 0 auto}
.nav-link{
  display:block;padding:.9rem 1.05rem;
  border-bottom:2px solid transparent;
  color:var(--steel);
  font-size:.85rem;letter-spacing:.26em;text-indent:.26em;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease),background var(--fast) var(--ease);
}
.nav-link:hover{color:var(--white);background:rgba(0,229,255,.06)}
.nav-link[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan)}

/* scrolled shrink */
[data-scrolled] .masthead{padding:.5rem 0 .45rem}
[data-scrolled] .brand-mark{font-size:clamp(1.05rem,2vw,1.3rem)}
[data-scrolled] .brand-tag{opacity:0}
[data-scrolled] .mono-dot{animation:none}

/* ---------- footer ---------- */
.site-footer{
  margin-top:clamp(3rem,7vw,6rem);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(17,24,35,.65),rgba(10,14,20,1) 70%);
}
.foot-shell{width:var(--shell);margin-inline:auto;padding:clamp(2.2rem,4vw,3.2rem) 0 1.4rem}
.foot-grid{display:grid;grid-template-columns:1.5fr repeat(3,minmax(0,1fr));gap:clamp(1.6rem,3vw,2.6rem)}
.foot-brand__mark{font-size:1.5rem}
.foot-summary{margin:1rem 0 0;max-width:34ch;color:var(--steel);font-size:.9rem;line-height:1.7}
.foot-contact{margin:1.2rem 0 0;display:grid;gap:.5rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em}
.foot-contact li{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem}
.foot-contact__key{min-width:3.2em;color:var(--steel);letter-spacing:.2em;text-transform:uppercase;font-size:.62rem}
.foot-contact__val{color:var(--white);word-break:break-word}
.copy-mail{
  padding:.34rem .6rem;
  border:1px dashed var(--line);border-radius:8px;
  background:transparent;color:var(--cyan);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.04em;
  cursor:pointer;word-break:break-all;text-align:left;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease),background var(--fast) var(--ease);
}
.copy-mail:hover{border-color:var(--cyan-soft);color:var(--cyan-soft)}
.copy-mail[data-copied]{border-style:solid;border-color:var(--orange);color:var(--orange);background:rgba(255,107,26,.1)}
.foot-col__title{
  margin:0 0 .9rem;padding-bottom:.6rem;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:.64rem;font-weight:600;letter-spacing:.26em;text-transform:uppercase;
  color:var(--white);
}
.foot-links{display:grid;gap:.55rem}
.foot-link{
  display:inline-block;
  color:var(--steel);font-size:.86rem;letter-spacing:.04em;
  transition:color var(--fast) var(--ease),padding-left var(--fast) var(--ease);
}
.foot-link:hover{color:var(--cyan);padding-left:.35rem}
.foot-legal{
  margin-top:clamp(1.8rem,4vw,2.8rem);padding-top:1.1rem;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.5rem 1.5rem;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.12em;color:var(--steel);
}
.foot-legal__note{margin:0}
.foot-legal__note--dim{color:rgba(138,151,168,.72)}
.foot-legal__icp{color:var(--white)}

/* ---------- breadcrumbs ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  margin:0 0 1.4rem;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--steel);
}
.crumbs a{color:var(--steel)}
.crumbs a:hover{color:var(--cyan-soft)}
.crumbs__sep{color:rgba(30,42,56,1);color:#33465b}
.crumbs [aria-current="page"]{color:var(--cyan)}

/* ---------- section / grid ---------- */
.section{padding:clamp(2.4rem,5vw,4.2rem) 0;position:relative}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:1rem;margin-bottom:clamp(1.2rem,2.5vw,1.9rem)}
.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(.7rem,1.4vw,1.15rem)}
.cell{grid-column:span 12;min-width:0}
@media (min-width:760px){
  .cell--half{grid-column:span 6}
  .cell--third{grid-column:span 4}
  .cell--quarter{grid-column:span 3}
  .cell--twothirds{grid-column:span 8}
}

/* ---------- card ---------- */
.card{
  position:relative;overflow:hidden;
  padding:clamp(1.1rem,2vw,1.7rem);
  border:1px solid var(--line);border-radius:var(--r-lg);
  background:linear-gradient(158deg,rgba(17,24,35,.96),rgba(10,14,20,.9));
  transition:border-color var(--fast) var(--ease),transform var(--fast) var(--ease);
}
.card::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(420px 220px at 100% 0,rgba(0,229,255,.15),transparent 70%);
  opacity:0;transition:opacity var(--mid) var(--ease);
}
.card:hover{border-color:#2c4055;transform:translateY(-2px)}
.card:hover::before{opacity:1}
.card__index{display:inline-block;margin:0 0 .6rem;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.24em;color:var(--cyan)}
.card__title{margin:0 0 .5rem;font-size:1.08rem}
.card__text{margin:0;color:var(--steel);font-size:.92rem;line-height:1.7}
.card__link{display:inline-flex;align-items:center;gap:.4em;margin-top:1rem;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;color:var(--cyan)}
.card--alert{border-color:rgba(255,107,26,.45)}
.card--alert .card__index{color:var(--orange)}

/* ---------- media ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);border-radius:var(--r-md);
  background:
    radial-gradient(420px 200px at 80% 0,rgba(0,229,255,.22),transparent 70%),
    linear-gradient(150deg,#101a24,#0a0e14 70%);
}
.media-frame img,.media-frame video{width:100%;height:100%;object-fit:cover}
.media-frame__glow{
  position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(0,229,255,.06) 0 1px,transparent 1px 5px);
  mix-blend-mode:screen;
}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--wide{aspect-ratio:21/9}

/* ---------- matrix ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-md);background:rgba(17,24,35,.72)}
.matrix{width:100%;min-width:560px;border-collapse:collapse;font-size:.9rem}
.matrix th,.matrix td{padding:.8rem 1rem;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.matrix thead th{
  background:var(--panel-2);
  font-family:var(--font-mono);font-size:.64rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;
  color:var(--cyan-soft);white-space:nowrap;
}
.matrix tbody th{font-weight:600;color:var(--white);white-space:nowrap}
.matrix td{color:var(--steel)}
.matrix .num{font-family:var(--font-mono);letter-spacing:.04em;color:var(--white)}
.matrix tr:last-child th,.matrix tr:last-child td{border-bottom:0}
.is-diff{color:var(--orange) !important;position:relative}
.is-diff::before{content:"△ ";font-size:.85em;letter-spacing:0}

/* ---------- chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:.5rem}
.chip{
  appearance:none;cursor:pointer;
  padding:.44rem 1rem;
  border:1px solid var(--line);border-radius:999px;
  background:transparent;color:var(--steel);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease),background var(--fast) var(--ease);
}
.chip:hover{color:var(--white);border-color:#2c4055}
.chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#04141a}

/* ---------- tabs ---------- */
.tablist{display:flex;gap:.3rem;overflow-x:auto;border-bottom:1px solid var(--line);scrollbar-width:none}
.tablist::-webkit-scrollbar{display:none}
.tab{
  flex:0 0 auto;appearance:none;cursor:pointer;
  padding:.75rem 1rem;
  border:0;border-bottom:2px solid transparent;
  background:transparent;color:var(--steel);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.tab:hover{color:var(--white)}
.tab[aria-selected="true"]{color:var(--cyan);border-bottom-color:var(--cyan)}
.tab-panel{padding-top:1.2rem}

/* ---------- accordion ---------- */
.qa{border:1px solid var(--line);border-radius:var(--r-md);background:rgba(17,24,35,.72);overflow:hidden}
.qa + .qa{margin-top:.6rem}
.qa__q{
  display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;
  padding:1rem 1.15rem;cursor:pointer;font-weight:700;list-style:none;
}
.qa__q::-webkit-details-marker{display:none}
.qa__q::after{content:"+";font-family:var(--font-mono);color:var(--cyan);font-size:1.1rem;line-height:1}
.qa[open] .qa__q::after{content:"−"}
.qa[open] .qa__q{color:var(--cyan-soft)}
.qa__a{padding:0 1.15rem 1.1rem;color:var(--steel);font-size:.92rem;line-height:1.75}

/* ---------- rail (章节时间轴) ---------- */
.rail{position:sticky;top:8.5rem;display:flex;flex-direction:column;gap:.1rem;padding-left:.9rem;border-left:1px solid var(--line)}
.rail-link{
  position:relative;display:block;padding:.42rem 0;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--steel);
  transition:color var(--fast) var(--ease);
}
.rail-link::before{
  content:"";position:absolute;left:-1rem;top:50%;width:6px;height:1px;
  background:var(--line);transform:translateY(-50%);
  transition:width var(--fast) var(--ease),background var(--fast) var(--ease);
}
.rail-link:hover{color:var(--white)}
.rail-link[aria-current="true"]{color:var(--cyan)}
.rail-link[aria-current="true"]::before{width:14px;height:2px;background:var(--orange)}

/* ---------- reveal ---------- */
[data-js] [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity 240ms var(--ease),transform 240ms var(--ease)}
[data-js] [data-reveal].is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .foot-grid{grid-template-columns:1fr 1fr;gap:1.8rem}
  .foot-brand{grid-column:1 / -1}
  .rail{position:static;flex-direction:row;flex-wrap:wrap;gap:.4rem;border-left:0;padding-left:0}
  .rail-link{padding:.35rem .75rem;border:1px solid var(--line);border-radius:999px}
  .rail-link::before{display:none}
  .rail-link[aria-current="true"]{border-color:var(--cyan)}
}
@media (max-width:880px){
  :root{--shell:min(100% - 1.6rem,1240px)}
  .masthead{grid-template-columns:1fr auto;grid-template-areas:"brand utility";gap:.6rem;padding:.85rem 0 .8rem}
  .masthead__meta{display:none}
  .masthead__brand{text-align:left}
  .brand-tag{margin-top:.2rem;letter-spacing:.34em;text-indent:.34em}
  .nav-toggle{display:inline-flex}
  .utility__link{display:none}
  .utility__link--icon{display:inline-flex}
  .nav-bar{display:none;border-top:1px solid var(--line);padding:.35rem 0 .6rem}
  .nav-bar[data-open]{display:block;animation:navIn var(--mid) var(--ease)}
  @keyframes navIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
  .nav-list{flex-direction:column;justify-content:flex-start;overflow:visible;gap:0}
  .nav-list__item{width:100%}
  .nav-link{
    padding:.8rem .2rem .8rem .9rem;
    border-bottom:1px solid var(--line);
    border-left:2px solid transparent;
    font-size:.9rem;letter-spacing:.18em;text-indent:.18em;
  }
  .nav-link[aria-current="page"]{border-bottom-color:var(--line);border-left-color:var(--cyan);background:rgba(0,229,255,.08)}
  .matrix{min-width:520px}
}
@media (max-width:620px){
  body{font-size:15px}
  .foot-grid{grid-template-columns:1fr}
  .foot-legal{flex-direction:column;align-items:flex-start}
  .copy-mail{font-size:.66rem}
  .qa__q{font-size:.95rem}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  [data-js] [data-reveal]{opacity:1;transform:none}
  .card:hover{transform:none}
  .btn:hover{transform:none}
}